You'll need to manually upload the transactions and receipts to recover the missing data, info2161.
Please be aware that when you remove a connected bank account, all associated transactions will be removed permanently. To keep your financial records accurate and up-to-date, you'll need to manually import these entries. Here's how:
1. Log in to your bank's website and download your transactions as a CSV file.
2. Open QuickBooks Self-Employed in a web browser.
3. Go to the Gear icon and select Imports transactions.

4. Choose Import older transactions next to the account you want to add transactions to.

5. Click Browse, locate the CSV file you downloaded from your bank, and select Open to begin the import.
6. Review the column headers and data, then click Continue to complete the import process.
Instead of disconnecting your bank account, I recommend hiding your connect bank account. This prevents the program from syncing new transactions while keeping your existing data.
Additionally, you can explore these articles for guidance on managing your downloaded online banking transactions:
Your financial management is our top priority. If you have any questions or need further help with your transactions, the QuickBooks Community team is here to assist you.